a bug in the training course

so when I started playing the game the first 3-6 hours were me trying to get cobalt in the training course I got gold not bad but that didn't stop me I tried to find any shortcut/exploit on my own to get it and i found an interesting thing so if you throw the grenade at the 3 puppets and pressed K immediately to restart the course and killed the starting dummy in 2-3 seconds you will see in the kill feed that the three dummies died by the grenade so even when you get to them you will see them dead, this is not that big of a bug/exploit but it will give you seconds.